Fluid transfer device

ABSTRACT

A fluid transfer device for transferring fluid between a supply reservoir and a fill reservoir includes a metering reservoir and a manifold that forms at least part of a first channel that is fluidly connected with the metering reservoir. The first channel comprises a first cannula extending from the manifold. The manifold forms at least part of a second channel fluidly connected with the metering reservoir. The second channel comprises a second cannula extending from the manifold. A third channel extends through the manifold and comprises a third cannula having a first end proximate a distal end of the first cannula and a second end proximate a distal end of the second cannula. A first check valve is disposed within the first channel and a second check valve is disposed within the second channel.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional PatentApplication No. 61/175,329 filed May 4, 2009 entitled “Fluid TransferDevice and Method of Use” which is incorporated by reference herein inits entirety.

BACKGROUND OF THE INVENTION

The present invention generally relates to a fluid transfer device and,in at least one embodiment, relates to a fluid transfer device fortransferring fluid from a sealed container such as a vial to a sealedfluid delivery device such as an ambulatory drug delivery device.

A wide range of injectable drug delivery devices are known in which afluid medicament, such as insulin, is stored in anexpandable-contractible reservoir. In such devices, the fluid isdelivered to the patient from the reservoir by forcing the reservoir tocontract. The term “injectable” is meant to encompass subcutaneous,intradermal, intravenous and intramuscular delivery.

Such devices can be filled by the manufacturer of the fluid deliverydevice or such devices can be filled by a pharmacist, a physician or apatient prior to use. If filled by the manufacturer, it may be difficultto provide the required drug stability in the device since the fluid maybe stored from several weeks to a number of years and the fluid deliverydevice manufacturer must then be responsible for providing the requiredfluid. If filled by someone downstream, it is difficult for such aperson to ensure that the fluid has completely filled the reservoir,i.e. that the reservoir and fluid path do not contain any undesirableair bubbles. In general, this requires priming the device by filling itin a certain orientation which ensures that the air is pushed ahead ofthe fluid, such as with the filling inlet at the bottom and the deliveryoutlet at the top (to allow the air to be displaced during filling).Also, transferring fluid from one container to another typically resultsin at least some wasted fluid.

It would therefore be desirable to provide an improved fluid transferdevice for safely and efficiently transferring fluid between twocontainers.

BRIEF SUMMARY OF THE INVENTION

In one embodiment, a fluid transfer device, for transferring fluidbetween a supply reservoir and a fill reservoir, comprises a meteringreservoir, a first flow path having a first one-way channel fluidlyconnected with the metering reservoir and configured to fluidly couplethe supply reservoir and the metering reservoir and a second one-waychannel fluidly connected with the metering reservoir and configured tofluidly couple the fill reservoir and the metering reservoir, and asecond flow path configured to fluidly couple the supply reservoir andthe fill reservoir. In one embodiment, the first one-way channelincludes a first cannula and the second one-way channel includes asecond cannula. In one embodiment, the first cannula includes a beveledtip. In one embodiment, the second cannula includes a beveled tip.

In a further embodiment, the fluid transfer device comprises a membersupporting the first and second cannulas, the first cannula extending ina first direction from the member and the second cannula extending in asecond direction from the member, the first direction being generallyopposite the second direction. In one embodiment, the metering reservoirextends from the member generally in the first direction.

In a further embodiment, the fluid transfer device comprises a manifoldthat supports the first and second cannulas, the manifold forming atleast part of the first one-way channel and at least part of the secondone-way channel. In one embodiment, the first cannula has a larger crosssectional area than a cross sectional area of the second cannula.

In a further embodiment, the fluid transfer device comprises a supplysupport configured to couple the fluid transfer device with the supplyreservoir. In one embodiment, the supply support includes at least onecatch proximate the first channel and configured to releasably retainthe supply reservoir. In one embodiment, the at least one catch includesat least two catches spaced different distances from the first channel.In one embodiment, the supply support includes at least one catchproximate the first channel and configured to non-releasably retain thesupply reservoir. In one embodiment, the supply support is configured toposition the first one-way channel within the supply reservoir and thefirst one-way channel is configured to transfer substantially all of thefluid from the supply reservoir.

In a further embodiment, the fluid transfer device comprises a membersupporting the first and second one-way channels and a tray supportconnected to the member and configured to align the fill reservoir withthe second one-way channel.

In a further embodiment, the fluid transfer device comprises a trayslideably connected to the tray support and configured to accommodatethe fill reservoir. In one embodiment, at least one of the tray supportand the tray further comprises a safety lock configured to prevent thetray from moving relative to the tray body when the tray is empty andexposing the second one-way channel. In a further embodiment, the fluidtransfer device comprises a safety reservoir configured to removeablycouple with the tray configured to block access to the second one-waychannel in an initial position. In one embodiment, the first one-waychannel includes a first cannula, the second one-way channel includes asecond cannula and the second flow path includes a third cannula. In oneembodiment, the third cannula is disposed within the first cannula and afirst end of the third cannula is curved toward an inner side wall ofthe first cannula proximate a distal end of the first cannula. In oneembodiment, a second end of the third cannula comprises a beveled tip.In one embodiment, the second and third cannula extend away from themetering reservoir, the second cannula extending further from themetering reservoir than the third cannula. In one embodiment, themetering reservoir includes a plunger. In one embodiment, the plungercomprises a plunger rod and a plunger tip. In one embodiment, themetering reservoir has a metering stop. In one embodiment, the meteringstop is adjustable. In one embodiment, the volume of the meteringreservoir is larger than the volume of the fill reservoir. In oneembodiment, the volume of the supply reservoir is larger than the volumeof the metering reservoir. In one embodiment, the second flow pathextends partially within the first one-way channel. In one embodiment, adistal end of the first one-way channel and a first end of the secondflow path are configured to sealingly engage with the supply reservoirand a distal end of the second one-way channel and a second end of thesecond flow path are each configured to sealingly engage with the fillreservoir. In one embodiment, the first and second one-way channels eachcomprise less than 200 μl of fluid transfer space. In one embodiment, avolume of the first one-way channel is less than a volume of the secondone-way channel. In one embodiment, the fill reservoir comprises a fluiddelivery device and the supply reservoir comprises a vial.

In another embodiment, a fluid transfer device comprises a meteringreservoir, a manifold forming at least part of a first channel, thefirst channel fluidly connected with the metering reservoir, the firstchannel comprising a first cannula extending from the manifold, themanifold forming at least part of a second channel, the second channelfluidly connected with the metering reservoir, the second channelcomprising a second cannula extending from the manifold, a third channelextending through the manifold and comprising a third cannula having afirst end proximate a distal end of the first cannula and a second endproximate a distal end of the second cannula, a first check valvedisposed within the first channel, and a second check valve disposedwithin the second channel. In one embodiment, the third cannula extendsat least partially through the first cannula and the second cannulaextends further from the manifold than the third cannula. In oneembodiment, the first cannula is larger than the second cannula.

In another embodiment, a fluid transfer device comprises a meteringreservoir, a first one-way channel fluidly connected with the meteringreservoir, and a second one-way channel fluidly connected with themetering reservoir. In one embodiment, the first channel includes afirst cannula and the second channel includes a second cannula. In oneembodiment, the first cannula includes a first beveled tip. In oneembodiment, the first cannula is configured to overcome the surfacetension resistance of a fluid within a supply reservoir positioned belowthe first beveled tip. In one embodiment, the second cannula includes asecond beveled tip. In a further embodiment, the fluid transfer devicecomprises a member supporting the first and second cannulas, the firstcannula extending in a first direction from the member and the secondcannula extending in a second direction from the member, the firstdirection being generally opposite the second direction. In oneembodiment, the metering reservoir extends from the member generally inthe first direction. In a further embodiment, the fluid transfer devicecomprises a manifold that supports the first and second cannulas, themanifold forming at least part of the first channel and at least part ofthe second channel.

In a further embodiment, the fluid transfer device comprises a membersupporting the first and second channels, and a tray support connectedto the member and configured to align a fill reservoir with the secondchannel. In a further embodiment, the fluid transfer device comprises atray slideably connected to the tray support and configured toaccommodate the fill reservoir. In one embodiment, at least one of thetray support and the tray further comprises a safety lock configured toprevent the tray from moving relative to the tray body when the tray isempty and exposing the second channel. In a further embodiment, thefluid transfer device comprises a safety reservoir configured toremoveably couple with the tray and comprising a penetrable bodyconfigured to block access to the second channel in an initial position.In a further embodiment, the fluid transfer device comprises a thirdchannel having a first end proximate a distal end of the first channeland a second end proximate a distal end of the second channel. In oneembodiment, the distal end of the first channel and the first end of thethird channel are configured to sealingly engage with a supply reservoirand the distal end of the second channel and the second end of the thirdchannel are each configured to sealingly engage with a fill reservoir.In one embodiment, the third channel is partially within the firstchannel. In one embodiment, the third channel is at least partiallygenerally coaxial with the first channel. In one embodiment, the firstend of the third channel is curved toward an inner side wall of thefirst channel proximate the distal end of the first channel. In oneembodiment, the first channel includes a first cannula, the secondchannel includes a second cannula and the third channel includes a thirdcannula. In one embodiment, the second end of the third cannulacomprises a beveled tip. In one embodiment, the second and third cannulaextend away from the metering reservoir, the second cannula extendsfurther from the metering reservoir than the third cannula channel. Inone embodiment, the metering reservoir has a volume that is greater thana volume of a fill reservoir configured to be fluidly engaged with thesecond one-way channel. In one embodiment, the fill reservoir comprisesa fluid transfer delivery device.

In a further embodiment, the fluid delivery device comprises at leastone first catch proximate the first channel and configured to releasablyretain a supply reservoir. In a further embodiment, the fluid deliverydevice further comprises at least one second catch proximate the firstchannel, the at least one second catch spaced from the first channelfurther than the at least one first catch is spaced from the firstchannel. In one embodiment, the metering reservoir includes a plunger.In one embodiment, the plunger comprises a plunger rod and a plungertip. In a further embodiment, the fluid delivery device comprises asupply support configured to accommodate a supply reservoir proximatethe first channel. In one embodiment, the metering reservoir has anadjustable metering stop. In one embodiment, the first and secondchannels comprise less than 100 μl of fluid transfer space. In oneembodiment, the first and second channels comprise less than 20 μl offluid transfer space. In a further embodiment, the fluid delivery devicecomprises an upper support coupled to the first one-way channel, and alower support coupled to the second one-way channel, the lower supportbeing moveable with respect to upper support, wherein moving the lowersupport relative to the upper support changes the volume of the meteringreservoir.

In another embodiment, a method of transferring fluid between a supplyreservoir and a fill reservoir in a pharmacological system, comprisesthe steps of: fluidly coupling the supply reservoir with the fillreservoir via a sealed flow path; and creating a pressure differentialbetween the supply reservoir and the fill reservoir to draw the fluidthrough the flow path and into the fill reservoir, wherein the overallvolume of each of the fill and supply reservoirs remains constant duringfluid transfer. In one embodiment, the flow path includes a meteringreservoir. In one embodiment, the supply reservoir is fluidly connectedto the metering reservoir via a first one-way channel and the meteringreservoir is fluidly connected to the fill reservoir via a secondone-way channel. In one embodiment, the method of transferring fluidbetween a supply reservoir and a fill reservoir in a pharmacologicalsystem, comprises the steps of: transferring a first volume of fluidfrom the supply reservoir into the fill reservoir; and transferring asecond volume of fluid substantially equal to the first volume of fluidfrom the fill reservoir into the supply reservoir via a third channel.In one embodiment, the pressure differential is created using a manuallyoperable pump, and the method further comprises the steps of: drawingthe piston to expand the volume of the metering reservoir and draw thefluid from the fill reservoir through the first channel and into themetering reservoir; and depressing the piston to contract the volume ofthe metering reservoir to expel the fluid through the second channel andinto the fill reservoir.

In another embodiment, a fluid transfer device comprises a meteringreservoir having an adjustable volume, a manifold forming at least partof a first channel, the first channel fluidly connected with themetering reservoir, the first channel comprising a first cannulaextending from the manifold, the manifold forming at least part of asecond channel, the second channel fluidly connected with the meteringreservoir, the second channel comprising a second cannula extending fromthe manifold, a third channel extending through the manifold andcomprising a third cannula having a first end proximate a distal end ofthe first cannula and a second end proximate a distal end of the secondcannula, a first check valve disposed within the first channel, and asecond check valve disposed within the second channel. In oneembodiment, the third cannula extends at least partially through thefirst cannula and second cannula extends further from the manifold thanthe third cannula.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The foregoing summary, as well as the following detailed description ofembodiments of the fluid transfer device, will be better understood whenread in conjunction with the appended drawings of exemplary embodiments.It should be understood, however, that the invention is not limited tothe precise arrangements and instrumentalities shown.

In the drawings:

FIG. 1 is a schematic drawing of a system in accordance with anembodiment of the present invention;

FIG. 2 is a schematic drawing of an alternative system in accordancewith an embodiment of the present invention;

FIG. 3 is an exploded perspective view of a fluid transfer device inaccordance with an exemplary embodiment of the present invention;

FIG. 4 is a partially exploded perspective view of a manifold and asupply support of the fluid transfer device of FIG. 3;

FIG. 5 is a cross-sectional view of the manifold and supply supportshown in FIG. 4;

FIG. 6 is an enlarged view of a portion of the manifold shown in FIG. 5;

FIG. 7 is a bottom plan view of the manifold shown in FIG. 4;

FIG. 8 is a front exploded perspective view of the manifold shown inFIG. 4;

FIG. 9 is a partially transparent front view of the manifold shown inFIG. 4 illustrating a fluid flow direction through a first channel;

FIG. 10 is a partially transparent bottom perspective view of themanifold shown in FIG. 4 illustrating a fluid flow direction through thesecond channel;

FIG. 11 is a partially transparent front view of the manifold shown inFIG. 3 illustrating a fluid flow direction through the second channeland a fluid flow direction through a third channel;

FIG. 12 is an exploded front perspective view of a tray and tray supportof the fluid delivery device of FIG. 3;

FIG. 13 is a rear perspective view of the fluid transfer device of FIG.3 with a back half of the tray support removed;

FIG. 14 is a perspective view of a needle shield of the fluid deliverydevice of FIG. 3;

FIG. 15 is a side elevational view of the fluid transfer device of FIG.3;

FIG. 16 is a rear elevational view of the fluid transfer device of FIG.3;

FIG. 17 is a front cross-sectional view of a fluid transfer device inaccordance with another exemplary embodiment of the present invention;

FIG. 18 is a front elevational view of the fluid transfer device of FIG.3 in a storage or initial position;

FIG. 19 is a front elevational view of the fluid transfer device of FIG.3 in a fill position and being held by a user;

FIG. 20 is a partial cross sectional view of the fluid transfer deviceof FIG. 3 in the fill position;

FIG. 21 is a partial cross sectional view of the fluid transfer deviceof FIG. 3 in a transfer position;

FIG. 22 is a partial cross sectional view of the fluid transfer deviceof FIG. 3 in a transferred position;

FIG. 23 is a schematic view of a fluid transfer device in accordancewith another exemplary embodiment of the present invention in an initialposition; and

FIGS. 24A-24C are perspective views of a fluid transfer device inaccordance with another exemplary embodiment of the present invention inthe initial, transfer and transferred positions, respectively.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings in detail, wherein like reference numeralsindicate like elements throughout, there is shown in FIGS. 1-23 a fluidtransfer device, generally designated 10, in accordance with anexemplary embodiment of the present invention.

Referring to FIGS. 1, 2, and 3, in one embodiment, the fluid transferdevice 10 forms part of a system that generally permits a fluid 12 froma supply reservoir 14 to be transferred to a fill reservoir 16. Thesupply reservoir 14 and the fill reservoir 16 may be any suitablecontainers for holding fluids. In one embodiment, the fluid transferdevice 10 sealingly transfers fluid between two otherwise sealedcontainers having predetermined volumes. In one embodiment, the supplyreservoir 14 is a drug vial 28. In one embodiment, the fill reservoir 16is contained within an ambulatory fluid delivery device 24. In oneembodiment, the fill reservoir 16 is a cartridge that is initially in arefracted position (i.e. filled with air). In one embodiment, the fluidtransfer device 10 is used in a pharmacological system to transfer fluidcontaining an active pharmaceutical ingredient (API), such as insulin,from the supply reservoir 14, e.g. a drug vial 28, to a fill reservoir16, e.g. a drug delivery device 24. The fluid 12 may be any fluid but inalternative embodiments the fluid 12 may include one or more of thefollowing: GLP1 and analogs, glucagon, oxytocin, somatostatin, fentanyl,morphine, amiodarone, epinephrine, isoproterenol, esmolol, haloperidol,heparin, remicade, lidocaine, vasopressin, antibodies, human growthhormone, erythropoeitin, Avastin®, Tarceva®, follicle stimulatinghormone, leutinizing hormone, human chorionic gonadotropin,corticosteroids, antibiotics, antivirals, antifungals orbenzodiazepines.

In one embodiment, the supply reservoir 14 is fluidly coupled with thefill reservoir 16 via a first flow path 18. In one embodiment, the firstflow path 18 is permitted to flow in only one direction. A change inpressure is initially created within the first flow path 18 to pull thefluid 12 from the supply reservoir 14 through the flow path 18 and intothe fill reservoir 16. In one embodiment, the fill reservoir 16 isprovided under positive or negative pressure with respect to atmosphericpressure prior to assembling the system such that fluidly connecting thesupply and fill reservoirs 14, 16 causes or assists in the exchange offluid 12. In one embodiment, the overall volumes of the supply and fillreservoirs 14, 16 remain constant during the fluid transfer. In oneembodiment, the change in pressure is created via a pump 18 a connectedto or provided within the first flow path 18. In another embodiment,described further below, the change in pressure is created through theuse of a metering reservoir 20 in connection with the first flow path18.

In one embodiment, the fluid transfer device 10 forms a closed loopsystem with the supply reservoir 14 and the fill reservoir 16 such thatfluid, either air or overflow liquid displaced from the fill reservoir16, as described in further detail below, is transferred to the supplyreservoir 14 and that the pressure in the supply and fill reservoirs 14,16 equalizes or balances with each other through at least one of thefirst and second flow paths 18, 22. A first volume of the fluid 12 istransferred from the supply reservoir 14 into the otherwise sealed fillreservoir 16 and a second volume of the fluid 12 substantially equal tothe first volume of the fluid 12 is transferred from the fill reservoir16 into the otherwise sealed supply reservoir 14 via a second flow path22. In one embodiment, the closed loop system of the fluid transferdevice 10 does not include or introduce ambient air in the system otherthan any air that may exist within the first and second flow paths 18,22 prior to fluidly connecting the supply and fill reservoirs 14, 16.

Such a closed loop system avoids introducing ambient air, which maycontain contaminants, into the supply and fill reservoirs 14, 16.Avoiding contact with ambient air is important in certainpharmacological applications where the fluid 12 degrades when in contactwith ambient air. The fluid transfer device 10 also reduces the distancethe fluid 12 must travel from the supply reservoir 14 to the fillreservoir 16 by minimizing the volume of the first flow path 18.Minimizing the volume of the first flow path 18 reduces mixing the fluid12 which may result in contaminations, degrading, agitating and/orfoaming the fluid 12. Such a closed loop system also prevents wastingthe fluid 12 as any overflow liquid 12 in the fill reservoir 16 isrecycled back into the supply reservoir 14. The fluid transfer device 10also reduces the number of steps and devices needed to transfer fluid 12from one sealed container to another sealed container.

The fluid transfer device 10 further allows a user to fill the fillreservoir 16 from the supply reservoir 14 without having to measure thefluid 12. In one embodiment, the fluid transfer device 10 is configuredfor use with differently sized supply and metering reservoirs 14, 16 andin various combinations. In such a system, excess fluid 12 may beprovided to ensure the fill reservoir 16 is full regardless of the sizeof the supply and metering reservoirs 14, 16 with any excess fluid 12returning back into the supply reservoir 14. The fluid transfer device10 may further allow an empty supply reservoir 14 to be exchanged withanother supply reservoir 14 part-way through filling the fill reservoir16. The fluid transfer device 10 may also allow a full fill reservoir 16to be exchanged with an empty fill reservoir 16 part-way throughemptying the supply reservoir 14. The fluid transfer device 10 maysubstantially empty the supply reservoir 14 such that the fluid 12 isnot wasted when discarding the used supply reservoir 14. The fluidtransfer device 10 may substantially reduce transferring air, ambientair and/or air contained within the system, into the fill reservoir 16.

Referring to FIG. 3, in one embodiment, the fill reservoir 16 comprisesa fluid delivery device 24. The fluid delivery device 24 may be anyknown device having an internal cavity, i.e. the fill reservoir 16, tobe filled with the fluid 12. In one embodiment, the fluid deliverydevice 24 administers the fluid 12 to a patient (not illustrated).Exemplary fluid delivery devices 24 for use with the fluid transferdevice 10 include the devices disclosed in U.S. Pat. No. 6,939,324, U.S.Pat. No. 7,481,792 and U.S. Pat. No. 7,530,968, which are herebyincorporated by reference in their entirety. In one embodiment, the fillreservoir 16 includes a piercable closure, i.e. a septum, 16 a and aplunger 16 b at the other end to seal the fill reservoir 16 from ambientair and form an air tight cavity (see FIGS. 5, 20). In one embodiment,the fill reservoir 14 comprises a vial 28. In one embodiment, the vial28 includes a closure 30, including a piercable member 32, such as aseptum, on a neck 34. The neck 34 may have a reduced diameter andextends from a vial body 36. The cap 30, neck 34 and vial body 36 areshown to each have a circular cross-section; however, the vial 28 maytake any shape such as square and be sealed from the ambient air in anysuitable manner to form an air tight cavity.

Referring to FIGS. 3-8, in one embodiment, the fluid delivery device 10includes a member or manifold 38. As described further below, themanifold 38 may be comprised of first, second and third sections 38 a,38 b, 38 c.

Referring to FIGS. 9-11, in one embodiment, the first fluid flow path 18is comprised of first and second one-way channels 40, 42. In oneembodiment, the first one-way channel (first channel) 40 fluidlyconnects the supply reservoir 14 with the metering reservoir 20. In oneembodiment, the second one-way channel (second channel) 42 fluidlyconnects the metering reservoir 20 with the fill reservoir 16. In oneembodiment, the first channel 40 has a volume less than a volume of thesecond channel 42. In one embodiment, having the volume of the firstchannel 40 being less than the volume of the second channel 42 preventsany air that is initially within the first channel 40 from beingtransferred to the fill reservoir 16 toward the end of delivery. The airthat is initially within the first channel 40 may be transferred to thefill reservoir 16 upon filling of a subsequent fill reservoir 16 but theair will be transferred toward the beginning of the fill and will riseto the top of the fill reservoir and be transferred back into the supplyreservoir 14 through the third cannula 48.

In one embodiment, the volumes of the first and second channels 40, 42are minimized to reduce waste of fluid (e.g. fluid remaining in thefirst and second channels 40, 42 after the final use). In oneembodiment, the first and second channels 40, 42 are configured suchthat the only fluid remaining in the first and second channels 40, 42after the final use is approximately equal to the difference in volumebetween the first and second channels 40, 42. For example, because theonly air within the system may be the air initially in the first andsecond channels 40, 42, the air initially within the first channel 40 isdrawn into the metering chamber 20 and rises to the top of the meteringchamber. Once the plunger 74 is depressed, the air initially within thesecond channel 42 is urged into the empty fill reservoir 16 displacingair back into the supply reservoir 14. Toward the end of the transfer,the air initially from the first channel 40 that is now in the meteringreservoir 20 is urged into the second channel 42. If the volume of thesecond channel 42 is larger than the volume of the first channel, theair initially within the first channel 40 that is urged into the secondchannel 42 remains within the second channel 42 without entering thefill reservoir 16 and creating an air bubble trapped in the fillreservoir 16.

In one embodiment, the length of the first channel 40 is minimized toreduce the time it takes to transfer fluid from the supply reservoir 14to the metering reservoir 20. In one embodiment, the cross sectionalarea of the first channel 40 is maximized as discussed above. In oneembodiment, the volume of the first channel 40 is approximately 116 μl.In one embodiment, the volume of the second channel 42 is approximately125 μl. In one embodiment, the first and second channels 40, 42 eachcomprise less than 600 μl of fluid transfer volume. In one embodiment,the first and second channels 40, 42 each comprise less than 500 μl offluid transfer volume. In one embodiment, the first and second channels40, 42 each comprise less than 400 μl of fluid transfer volume. In oneembodiment, the first and second channels 40, 42 each comprise less than300 μl of fluid transfer volume. In one embodiment, the first and secondchannels 40, 42 each comprise less than 200 μl of fluid transfer volume.In one embodiment, the first and second channels 40, 42 each compriseless than 100 μl of fluid transfer volume. In one embodiment, the firstand second channels 40, 42 each comprise less than 90 μl of fluidtransfer volume. In one embodiment, the first and second channels 40, 42each comprise less than 80 μl of fluid transfer volume. In oneembodiment, the first and second channels 40, 42 each comprise less than70 μl of fluid transfer volume. In one embodiment, the first and secondchannels 40, 42 each comprise less than 60 μl of fluid transfer volume.In one embodiment, the first and second channels 40, 42 each compriseless than 50 μl of fluid transfer volume. In one embodiment, the firstand second channels 40, 42 each comprise less than 40 μl of fluidtransfer volume. In one embodiment, the first and second channels 40, 42each comprise less than 30 μl of fluid transfer volume. In oneembodiment, the first and second channels 40, 42 each comprise less than20 μl of fluid transfer volume. In one embodiment, the first and secondchannels 40, 42 each comprise less than 10 μl of fluid transfer volume.

In one embodiment, the fluid transfer device 10, including first andsecond channels 40, 42, are configured to deliver a substantiallynon-agitating or non-turbulent fluid flow when transferring the fluid 12from the supply reservoir 14 to the fill reservoir 16.

Referring to FIG. 5, in one embodiment, the distal end 44 a of the firstchannel 40 and the first end 48 a of the third channel 22 are configuredto sealingly engage with a supply reservoir 14 and the distal end 46 aof the second channel 42 and the second end 48 b of the third channel 22are each configured to sealingly engage with a fill reservoir 16. In oneembodiment, the first channel 40 includes a first cannula 44 and thesecond channel 42 includes a second cannula 46. In one embodiment, thesecond fluid flow path or third channel 22 includes a third cannula 48.In one embodiment, the first channel 40 extends from the distal tip 44 aof the first cannula 44 to the metering reservoir 20. In one embodiment,the second channel 42 extends from the metering reservoir 20 to thedistal tip 46 a of the second cannula 46. In one embodiment, themanifold 38 rigidly supports the first, second and third cannulas 44,46, 48. The first cannula 44 extends from the first section 38 a of themanifold 38 in a first direction and the second cannula 46 extends fromthe third section 38 c of the manifold 38 in a second direction. In oneembodiment, the first direction is generally opposite the seconddirection. In another embodiment, the metering reservoir 20 extends fromthe manifold 38 generally in the first direction. In one embodiment, thethird cannula 48 extends through the manifold 38 and has a first end 48a proximate a distal tip 44 a of the first cannula 44 and a second end48 b proximate a distal tip 46 b of the second cannula 46. In oneembodiment, the second cannula 46 extends from the manifold 38 furtherthan the third cannula 48 extends from the manifold 38. In such anembodiment as shown and when used in a generally vertical manner withthe supply reservoir 14 above the fill reservoir 16, the orientation ofthe supply, transfer and fill reservoirs 14, 20, 16 along with thelength of the first and second channels 40, 42 extending in therespective supply and fill reservoirs 14, 16 minimizes and substantiallyeliminates air within the supply and metering reservoirs 14, 20 fromentering the first and second channels 40, 42 and keeps the fluid 14 inthe fill reservoir 16 from entering the third channel 22 until the fillreservoir 16 is substantially full. Keeping system air out of the firstand second channels 40, 42 reduces foaming and agitation of the liquid12 within the fill reservoir 16.

Referring to FIGS. 9 and 10, in one embodiment, the size, (e.g. crosssectional area, length and volume) of the first channel, 40, and thesecond channel, 42, are critical to the speed with which the fluid maybe transferred. Restrictive flow through the first channel 40 and firstcannula 44 may increase the time required for the fluid to stop flowinginto the metering reservoir 20 from the supply reservoir 14. Restrictiveflow through the second channel 42 and second cannula 46 may be desiredto slow down the transfer from the metering reservoir 20 into the fillreservoir 16. In one embodiment, the user must hold the plunger rod 74(FIG. 4) in the up or transfer position (FIG. 21) until the pressurebetween the metering reservoir 20 and the supply reservoir 14 isequalized. Releasing the plunger rod 74 prior to the pressure equalizingmay result in the plunger rod 74 being pulled into the meteringreservoir 20 prior to a full volume of fluid being transferred from thesupply reservoir 14 to the metering reservoir 20. The force required tohold the plunger rod 74 in the up position may be proportional to thepressure differential between the supply reservoir 14 and the meteringreservoir 20. In other embodiments, the user holds the plunger rod 74 inthe up or transfer position until the metering reservoir 20 issubstantially full and then the user depresses the plunger rod 74without waiting for the pressure between the supply reservoir 14 and themetering reservoir 20 to equalize. Rapid flow of the fluid 12 into themetering reservoir 20, as the plunger rod 74 is being drawn up, willreduce the force and time required by the user. Restrictive flow of thefluid 12 from the metering reservoir 20, as the plunger rod 74 is beingdepressed, will help the user have control of the transfer of the fluid12 from the metering reservoir into the fill reservoir 16. In oneembodiment, the transfer of the fluid 12 from the metering reservoirinto the fill reservoir 16 is done drop by drop or in a non-turbulentmanner in order to ensure that any air in the system stays toward thetop of the fill reservoir 16. In one embodiment, the total volume of thesecond channel 42 is larger than the total volume of the first channel40 such that any air initially in the first and second channels 40, 42remains in the metering reservoir and is not transferred into the fillreservoir 16.

In one embodiment, the second and third cannulas 46, 48 are as small aspossible to prevent damage to the closure 16 a of the fill reservoir 16and to reduce or prevent fluid turbulence as described above whileallowing sufficient air and fluid transfer from the fill reservoir 16back into the supply reservoir 14. In one embodiment, the second andthird cannulas 46, 48 are substantially similar in diameter. In oneembodiment, the third cannula 48 has a diameter that is at least aslarge as or larger than the diameter of the second cannula 46. In oneembodiment, the first cannula 44 has a larger cross sectional area thana cross sectional area of the second cannula 46. In one embodiment, thefirst cannula 44 is a 16 gauge needle. In one embodiment, the second andthird cannulas 46, 48 are 29 gauge needles. In one embodiment, the firstcannula 44 is an 8 gauge needle. In one embodiment, the first cannula 44is the largest diameter needle that prevents or reduces coring of thevial septum 32 while keeping in mind that the larger the first channel40 is the more air that is initially introduced into the system. Any airinitially within the first channel 40 may be contained within the secondchannel 42 by making the second channel 42 larger than the first channelas discussed below. Using the largest diameter needle that prevents orreduces coring of the vial septum may allow for the maximum flow ratebetween the supply reservoir 14 and the metering reservoir 20 whileallowing the supply reservoir 14 to continue functioning as a sealedcontainer following removal of the supply reservoir 14 from the fluidtransfer device 10. In one embodiment, the first cannula 44 is a 16gauge needle and the supply reservoir is a 10 ml vial. In anotherembodiment, the first cannula 44 is configured (e.g. diameter and/orcross sectional area) to give the desired flow rate between the supplyreservoir 14 and the metering reservoir 20 without a concern for theresealability of the vial septum 32 if the supply reservoir 14 is to bediscarded after removal or the supply reservoir 14 is never removed fromthe fluid transfer device 10.

In one embodiment, the first, second and third cannulas 44, 46, 48 andthe first and second channels 40, 42 are configured (e.g. diameter,cross sectional area and/or length) such that fluid 12 is transferredfrom the supply reservoir 14 into the metering reservoir in less than 10seconds. In one embodiment, the first, second and third cannulas 44, 46,48 and the first and second channels 40, 42 are configured (e.g.diameter, cross sectional area and/or length) such that fluid 12 istransferred from the supply reservoir 14 into the metering reservoir inless than 9 seconds. In one embodiment, the first, second and thirdcannulas 44, 46, 48 and the first and second channels 40, 42 areconfigured (e.g. diameter, cross sectional area and/or length) such thatfluid 12 is transferred from the supply reservoir 14 into the meteringreservoir in less than 8 seconds. In one embodiment, the first, secondand third cannulas 44, 46, 48 and the first and second channels 40, 42are configured (e.g. diameter, cross sectional area and/or length) suchthat fluid 12 is transferred from the supply reservoir 14 into themetering reservoir in less than 7 seconds. In one embodiment, the first,second and third cannulas 44, 46, 48 and the first and second channels40, 42 are configured (e.g. diameter, cross sectional area and/orlength) such that fluid 12 is transferred from the supply reservoir 14into the metering reservoir in less than 6 seconds. In one embodiment,the first, second and third cannulas 44, 46, 48 and the first and secondchannels 40, 42 are configured (e.g. diameter, cross sectional areaand/or length) such that fluid 12 is transferred from the supplyreservoir 14 into the metering reservoir in less than 5 seconds. In oneembodiment, the first, second and third cannulas 44, 46, 48 and thefirst and second channels 40, 42 are configured (e.g. diameter, crosssectional area and/or length) such that fluid 12 is transferred from thesupply reservoir 14 into the metering reservoir in less than 4 seconds.In one embodiment, the first, second and third cannulas 44, 46, 48 andthe first and second channels 40, 42 are configured (e.g. diameter,cross sectional area and/or length) such that fluid 12 is transferredfrom the supply reservoir 14 into the metering reservoir in less than 3seconds. In one embodiment, the first, second and third cannulas 44, 46,48 and the first and second channels 40, 42 are configured (e.g.diameter, cross sectional area and/or length) such that fluid 12 istransferred from the supply reservoir 14 into the metering reservoir inless than 2 seconds. In one embodiment, the first, second and thirdcannulas 44, 46, 48 and the first and second channels 40, 42 areconfigured (e.g. diameter, cross sectional area and/or length) such thatfluid 12 is transferred from the supply reservoir 14 into the meteringreservoir in less than 1 second. In one embodiment, the first, secondand third cannulas 44, 46, 48 and the first and second channels 40, 42are configured (e.g. diameter, cross sectional area and/or length) suchthat fluid 12 is transferred from the supply reservoir 14 into themetering reservoir in less than 0.5 seconds. In one embodiment, thefirst, second and third cannulas 44, 46, 48 and the first and secondchannels 40, 42 are configured (e.g. diameter, cross sectional areaand/or length) such that fluid 12 is transferred from the supplyreservoir 14 into the metering reservoir in less than 0.1 seconds. Inone embodiment, the first, second and third cannulas 44, 46, 48 and thefirst and second channels 40, 42 are sized and configured (e.g.diameter, cross sectional area and/or length) such that fluid 12 istransferred from the supply reservoir 14 into the metering reservoir inless than 0.1 seconds.

In one embodiment, the distal tip 44 a of the first cannula 44 includesa beveled tip for piercing the closure 32 of the supply reservoir 14. Inone embodiment, the distal tip 46 a of the second cannula 46 includes abeveled tip for piercing the septum 16 a of the fill reservoir 16. Inone embodiment, the second end 48 b of the third cannula 48 includes abeveled tip for piercing the septum 16 a of the fill reservoir 16. Inone embodiment, the third cannula 48 extends along side of the secondcannula 46. In an alternative embodiment, the third cannula 48 ispositioned partially within the second cannula 46 (not shown). In oneembodiment, the third cannula 48 partially extends through or within thefirst cannula 44. In one embodiment, the third cannula 48 is partiallyco-axial with the first cannula 44. In another embodiment, the first end48 a of the third cannula 48 is curved toward an inner side wall of thefirst cannula 44 proximate the distal end 44 a of the first cannula 44such that first end 48 a of the third cannula 48 follows an entry pathof the first cannula 44 through the septum 32 of the supply reservoir 14and avoids piercing the septum 32 more than once (e.g. creating a ringshaped piercing). In one embodiment, the second cannula 46 extends fromthe manifold 38 further than the third cannula 48 extends from themanifold 38 such that transferred fluid 12 does not go directly from thesecond cannula 46 and into the third cannula 48 due to surface tensionon the second cannula 46 and pressure differentials between the supplyand fill reservoirs 14, 16 without first filling the fill reservoir 16.

In one embodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 250:1. In one embodiment, a ratio ofan inner diameter of the first cannula 44 proximate the distal end 44 aand an outer diameter of the third cannula 48 proximate the first end 48a is 200:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 150:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 100:1. In one embodiment, a ratio ofan inner diameter of the first cannula 44 proximate the distal end 44 aand an outer diameter of the third cannula 48 proximate the first end 48a is 50:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 25:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 20:1. In one embodiment, a ratio ofan inner diameter of the first cannula 44 proximate the distal end 44 aand an outer diameter of the third cannula 48 proximate the first end 48a is 150:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 10:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 5:1. In one embodiment, a ratio of aninner diameter of the first cannula 44 proximate the distal end 44 a andan outer diameter of the third cannula 48 proximate the first end 48 ais 2.5:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 2.4:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 2.3:1. In one embodiment, a ratio ofan inner diameter of the first cannula 44 proximate the distal end 44 aand an outer diameter of the third cannula 48 proximate the first end 48a is 2.2:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 2.1:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 2.0:1. In one embodiment, a ratio ofan inner diameter of the first cannula 44 proximate the distal end 44 aand an outer diameter of the third cannula 48 proximate the first end 48a is 1.9:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 1.8:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 1.7:1. In one embodiment, a ratio ofan inner diameter of the first cannula 44 proximate the distal end 44 aand an outer diameter of the third cannula 48 proximate the first end 48a is 1.6:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 1.5:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 1.4:1. In one embodiment, a ratio ofan inner diameter of the first cannula 44 proximate the distal end 44 aand an outer diameter of the third cannula 48 proximate the first end 48a is 1.3:1. In one embodiment, a ratio of an inner diameter of the firstcannula 44 proximate the distal end 44 a and an outer diameter of thethird cannula 48 proximate the first end 48 a is 1.2:1. In oneembodiment, a ratio of an inner diameter of the first cannula 44proximate the distal end 44 a and an outer diameter of the third cannula48 proximate the first end 48 a is 1.1:1. The sizes and respectiveratios of the first, second and third cannulas 44, 46, 48 may be varieddepending on desired flow characteristics and the characteristics andorientation of the supply and fill reservoirs 14, 16.

In one embodiment, the first channel 40 includes a first check valve 50to allow the fluid 12 to only flow through the first channel 40 in asingle direction, i.e. from the supply reservoir 14 to the meteringreservoir 20. The second channel 42 includes a second check valve 52 toallow the fluid 12 to only flow through the second channel 42 in asingle direction, i.e. from the metering reservoir 20 to the fillreservoir 16. In the exemplary embodiment, the first and second checkvalves 50, 52 are umbrella valves. However, the first and second checkvalves 50, 52 may be any device or any orientation of the first andsecond channels 40, 42 that prevents fluid-flow in two directions suchas duck-bill valves, cross-slit valves, floating ball valves, membranesor micropumps. In another alternative embodiment, the first and secondchannels 40, 42 may include more than one check valve 50, 52 to ensurefluid flow within each first and second channel 40, 42 is in a singledirection. In an alternative embodiment, the first and second checkvalves 50, 52 may be combined into a single valve (not shown) such as athree way valve.

Referring to FIG. 17, in another alternative embodiment, the first andsecond check valves 50′, 52′ are positioned in the first and secondcannulas 44′, 46′ respectively. In one embodiment, the first and secondcannulas 44′, 46′ are generally co-axial. In one embodiment, the firstand second cannulas 44′, 46′ abut or conjoin with the third cannula 48′such that a single sealed entry point is created with the supply andfill reservoirs 14, 16. In an alternative embodiment, one or more valves(not shown) is positioned within the manifold 38′ between the first andsecond cannulas 44′ at a first flow path junction 18 b′ such that thefluid 12 is only permitted to flow from the supply reservoir 14 into thefill reservoir 16 in the first flow path 18. In yet another alternativeembodiment, the first and second cannulas 44, 46 are formed by a singlecannula (not shown) that contains a three-way valve (not shown)connected to the metering reservoir 20. In yet another alternativeembodiment, the single cannula may contain one or more a micropump orMEMS (not shown) within the single cannula. In an alternativeembodiment, the first and second channels 40, 42 do not include valvesand the one-way flow within the first and second channels 40, 42 iscontrolled via the pressure differentials and/or the configuration ofthe first and second flow paths 18, 22 (not illustrated). In analternative embodiment, one or more of the check valves 50′, 52′ areprovided in either or both of the supply and fill reservoirs 14′, 16′rather than in the first and/or second channels 40, 42.

Referring to FIGS. 5-8, in one embodiment, the manifold 38 at leastpartially defines the first and second channels 40, 42. In oneembodiment, the second section 38 b substantially forms the first andsecond channels 40, 42 extending between the first and second cannulas44, 46 respectively. In one embodiment, the first and second checkvalves 50, 52 are attached to the second section 38 b within the firstand second channels 40, 42 respectively. In one embodiment, the firstand third sections 38 a, 38 c sandwich the second section 38 b anddefine the remainder of the first and second channels 40, 42. In oneembodiment, the third cannula 48 is attached to the second section 38 b.However, the third cannula 48 may be segmented such that the manifolddefines a portion of the third channel 22.

Referring to FIGS. 6-8, the first and second sections 38 a, 38 b maydefine a first raceway 54 proximate an upper perimeter of the first andsecond channels 40, 42 and the second and third sections 38 b, 38 c maydefine a second raceway 56 proximate a lower perimeter of the first andsecond channels 40, 42. In one embodiment, the first and second raceways54, 56 are filled with an adhesive (not visible) to attach the first andthird sections 38 a, 38 c to the second section 38 b and form a sealinggasket around the first and second channels 40, 42. In one embodiment,the adhesive is a UV curable adhesive such as a LOCTITE® product. Inanother embodiment, the adhesive is inserted into the first and secondraceways 54, 56 after stacking the first, second and third sections 38a, 38 b, 38 c of the manifold 38. However, the first and second raceways54, 56 may be filled with any adhesive or sealing substance before orafter assembling the manifold 38 and the manifold may alternatively beheld together by one or more mechanical fasteners such as a snap fitgroove, spot weld and/or ultrasonic weld that does not require adhesive.

Referring to FIGS. 3-5, the fluid transfer device 10 includes a supplysupport 58 configured to accommodate the supply reservoir 14 proximatethe first cannula 44. In one embodiment, the supply support 58 isrigidly attached to the first section 38 a of the manifold 38. Thesupply support 58 may alternatively be integrally formed with themanifold 38. In one embodiment, the supply support 58 includes at leastone opening 60 configured to allow a user to contact the vial body 36 ofthe supply reservoir 14. In one embodiment, the supply support 58includes two laterally spaced openings 60 such that the supply reservoir14 can be pinched between two fingers during insertion and removal ofthe supply reservoir 14. In one embodiment, the at least one opening 60is configured to be generally tangent to the supply reservoir 14 tominimize the tendency to twist the supply reservoir 14 relative to thesupply support 58. In one embodiment, the supply support 58 includessupply reservoir indicia 58 b to indicate where and/or how to insert thesupply reservoir 14. In one embodiment, the supply support 58 includesfill indicia 58 c which illustrates the steps to perform in filling thesupply reservoir 16.

Referring to FIG. 3, in a further embodiment, the supply support 58includes an adapter 62. In one embodiment, the adapter 62 is optionallyprovided to accommodate and/or support differently sized supplyreservoirs 14. In one embodiment, the adapter 62 is a sleeve that slidesover and snap or compression fits onto the vial 28. In one embodiment,the adapter 62 includes arms 62 b that snap or compression fit proximateor onto the neck 34. In one embodiment, the adapter 62 includesdiametrically opposed projections 62 a that slide into the openings 60of the supply support 58 and prevent the adapter 62 from twistingrelative to the supply support 58 and block a view of the fluid 12through the supply support 58 and may aid in removing the adapter 62from the supply support 58.

Referring to FIGS. 4 and 9, the fluid transfer device 10 may include aplurality of projections 64 extending in the first direction and spacedaround the first cannula 44. The projections 64 may slidingly engagewith the closure 30 (see FIG. 3) when the supply reservoir 14 isinserted over the distal end 44 a of the first cannula 44. In oneembodiment, at least one of the projections 64 includes a first radiallyinwardly projecting catch 66 configured to releasably retain the supplyreservoir 14 by extending over the closure 30 proximate the neck 34. Inanother embodiment, at least one of the projections includes a secondradially inwardly projection catch 68 configured to releasably retainthe supply reservoir 14 by extending over the closure 30 proximate theneck 34. In one embodiment, the first and second catches 66, 68 arespaced from the manifold 38 different distances such that differentsized closures 30 may be accommodated. In one embodiment, the firstsection 38 a of the manifold 38 may space the supply reservoir 14 asufficient distance along the first cannula 44 such that the distal end44 a of the first cannula 44 extends entirely within the supplyreservoir 14 in the fill position (FIG. 20). In one embodiment, theprojections 64 are integrally formed with the manifold 38. Referring toFIG. 10, in another embodiment, at least one the catches 66′, 68′ areconfigured to fixedly retain the supply reservoir 14 such that the usercannot remove the supply reservoir 14 after use covering and protectingthe first cannula 44.

Referring to FIG. 5, in one embodiment, the first cannula 44 pierces theclosure 32 and extends into the supply reservoir 14 in the fillposition. The inner diameter of the first cannula 44 is sufficientlysized and positioned such that once the fluid 12 is drained below thebevel of the first cannula 44, the vacuum within the first channel 40 issufficient to overcome the surface tension resistance of the fluid 12that exists between the fluid 12 and the inner surface of the supplyreservoir 14 to substantially empty the supply reservoir 14 to maximizefluid transfer and prevent wasting the fluid 12. In one embodiment, thediameter and position of the first cannula 44 within the supplyreservoir 14 is configured to extract at least 90 percent of the fluid12 from the supply reservoir 14. In one embodiment, the diameter andposition of the first cannula 44 within the supply reservoir 14 isconfigured to extract at least 91 percent of the fluid 12 from thesupply reservoir 14. In one embodiment, the diameter and position of thefirst cannula 44 within the supply reservoir 14 is configured to extractat least 92 percent of the fluid 12 from the supply reservoir 14. In oneembodiment, the diameter and position of the first cannula 44 within thesupply reservoir 14 is configured to extract at least 93 percent of thefluid 12 from the supply reservoir 14. In one embodiment, the diameterand position of the first cannula 44 within the supply reservoir 14 isconfigured to extract at least 94 percent of the fluid 12 from thesupply reservoir 14. In one embodiment, the diameter and position of thefirst cannula 44 within the supply reservoir 14 is configured to extractat least 95 percent of the fluid 12 from the supply reservoir 14. In oneembodiment, the diameter and position of the first cannula 44 within thesupply reservoir 14 is configured to extract at least 96 percent of thefluid 12 from the supply reservoir 14. In one embodiment, the diameterand position of the first cannula 44 within the supply reservoir 14 isconfigured to extract at least 97 percent of the fluid 12 from thesupply reservoir 14. In one embodiment, the diameter and position of thefirst cannula 44 within the supply reservoir 14 is configured to extractat least 98 percent of the fluid 12 from the supply reservoir 14. In oneembodiment, the diameter and position of the first cannula 44 within thesupply reservoir 14 is configured to extract at least 98.5 percent ofthe fluid 12 from the supply reservoir 14. In one embodiment, thediameter and position of the first cannula 44 within the supplyreservoir 14 is configured to extract at least 99 percent of the fluid12 from the supply reservoir 14. In one embodiment, the diameter andposition of the first cannula 44 within the supply reservoir 14 isconfigured to extract at least 99.5 percent of the fluid 12 from thesupply reservoir 14. In one embodiment, the diameter and position of thefirst cannula 44 within the supply reservoir 14 is configured to extractat least 99.9 percent of the fluid 12 from the supply reservoir 14. Inone embodiment, the diameter and position of the first cannula 44 withinthe supply reservoir 14 is configured to extract at least 99.99 percentof the fluid 12 from the supply reservoir 14. In one embodiment, thediameter and position of the first cannula 44 within the supplyreservoir 14 is configured to extract at least 99.999 percent of thefluid 12 from the supply reservoir 14.

Referring to FIG. 4, in one embodiment, the supply support 58 includesat least one viewing window 70 such that the amount of fluid 12remaining within the supply reservoir 14, or lack of fluid 12 within thesupply reservoir 14, can be seen by the user. In one embodiment, theviewing window 70 at least partially exposes the neck 34 of the vial 28such that the user can determine if the supply reservoir 14 is empty. Inone embodiment, the empty supply reservoir 14 may be exchanged with afull supply reservoir 14 to continue filling the fill reservoir 16.

Referring to FIGS. 4 and 5, in one embodiment, the metering reservoir 20includes a plunger 72. However, the metering reservoir 20 may be anydevice that is configured to exchange the fluid 12 within the systemand/or impart a pressure differential. In one embodiment, the plunger 72is manually operable and comprises a plunger rod 74 and a plunger tip76. In one embodiment, the plunger tip 76 is constructed of anelastomeric material that seals the metering reservoir 20 from theambient air. In one embodiment, the plunger rod 74 includes a tab 74 afor a user to grip between a thumb 26 c and an index finger 26 d (FIG.19). In alternative embodiments, the volume of the metering reservoir 20is controlled by flexing the metering reservoir 20 (not illustrated). Inalternative embodiment, the plunger 72 may be threadably connected tothe metering reservoir 20 such that a twisting motion by the usercontrols the volume of the metering reservoir 20 (not illustrated). Inanother alternative embodiment, the volume of the metering reservoir 20is controlled by a device such as a mechanically controlled pistonactivated by a push button, lever or wheel or an electro-mechanicalactuating device (not shown).

In one embodiment, the supply support 58 includes a metering stop 78that acts as a limit stop for the plunger 72. In one embodiment, themetering stop 78 is adjustable such that the predetermined volume of themetering reservoir 20 is adjustable. In one embodiment, the meteringreservoir 20 has a maximum volume that is greater than the volume of thefill reservoir 16. In one embodiment, the supply reservoir 14 has avolume greater the maximum volume of the metering reservoir 20. In oneembodiment, the maximum volume of the metering reservoir 20 is up to 50%greater than the volume of the fill reservoir 16. In one embodiment, themaximum volume of the metering reservoir 20 is up to 40% greater thanthe volume of the fill reservoir 16. In one embodiment, the maximumvolume of the metering reservoir 20 is up to 30% greater than the volumeof the fill reservoir 16. In one embodiment, the maximum volume of themetering reservoir 20 is up to 20% greater than the volume of the fillreservoir 16. In one embodiment, the maximum volume of the meteringreservoir 20 is up to 10% greater than the volume of the fill reservoir16. In one embodiment, the maximum volume of the metering reservoir 20is up to 5% greater than the volume of the fill reservoir 16.

In one embodiment, the excess fluid 12 from the fill reservoir 16delivered to the fill reservoir 16 is delivered back into the supplyreservoir 14. In one embodiment, the predetermined volume of themetering reservoir 20 is adjusted depending on the volume of the fillreservoir 16, the size of the first and second channels 40, 42 and/or afactor of safety or redundancy to account for air transfer within thesystem such as may be caused by tilting the fluid transfer device 10from vertical toward horizontal or any air pre-existing within the firstand second channels 40, 42. In one embodiment, the metering stop 78includes projections 78 a that extend outwardly and are insertable intorecesses 58 a in the supply support 58. In one embodiment, the plungerrod 74 engages with the metering stop 78 at the limit position toprevent further drawing of the plunger 72. In one embodiment, theplunger rod 74 includes a projection 74 b that contacts the meteringstop 78 at the limit position. In an alternative embodiment, the excessfluid 12 from the fill reservoir 16 is not returned back into the supplyreservoir 14 but is instead delivered to an overflow chamber (not shown)or permitted to freely drain from the system (not illustrated).

In one embodiment, the metering reservoir 20 includes an air valve (notshown) that allows for air within the metering reservoir 20 to beexpelled from the metering reservoir 20 rather than sent through thesecond channel 42. In one embodiment, the air valve is a wettablemembrane that allows air to pass through the air valve but not the fluid12. In one embodiment, the air valve is positioned proximate the top ofthe metering reservoir 20 to purge any air within the system (e.g. airinitially within the first channel 40) before the fluid drawn into themetering reservoir 20 contact the air valve.

Referring to FIGS. 12 and 13, in one embodiment, the fluid transferdevice 10 includes a tray support 80 connected to the manifold 38 andthat is configured to align the fill reservoir 16 with the secondcannula 46. In one embodiment, a tray 82 is slideably connected to thetray support 80 and is configured to accommodate the fill reservoir 16or a fluid delivery device 24 containing the fill reservoir 16. In oneembodiment, the tray support 80 includes a pair of slide rails 84 (onlyone slide rail visible). In one embodiment, the tray 82 is slideablymounted to the slide rails 84 to allow positioning the tray 82 towardand away from the manifold 38. In one embodiment, the tray 82 includes aplurality of projections 82 a that contact alternate sides of the rails84 along the length of each rail 84. In one embodiment, the second andthird cannulas 46, 48 extend into the tray 82.

Referring to FIGS. 12-14, in one embodiment, a cannula guide 82 bcaptures the distal end 46 a of the second cannula 46 and the second end48 b of the third cannulas 48 b and directs the second and thirdcannulas 46, 48 into the tray 82 as the tray 82 is slid toward themanifold 38. The cannula guide 82 b may also help to prevent damage tothe second and third cannulas 46, 48 during assembly and use. In oneembodiment, the cannula guide 82 b is fixedly attached to the tray 82.In one embodiment, the cannula guide 82 b is integral with the tray 82.In one embodiment, a sheath 38 d extends downwardly from the manifold 38at least partially surrounding the second and third cannulas 46, 48. Thecannula guide 82 b may overlap with the sheath 38 d to allow formovement of the tray 82 relative to the manifold 38. In one embodiment,the cannula guide 82 b is slideably coupled with sheath 38 d. In oneembodiment, the sheath 38 d extends over the cannula guide 82 b.

In another embodiment, the cannula guide 82 b extends over the sheath 38d (not shown). In one embodiment, the cannula guide 82 b and the sheath38 d are generally cylindrical. In other embodiments, the cannula guide82 b and the sheath 38 d have any suitable shape such as triangular orrectangular (not shown). In one embodiment, the sheath 38 d includes aside opening for molding purposes.

Referring to FIG. 14, because the second and third cannulas 46, 48 arerelatively thin needles in one embodiment, the cannula guide 82 b mayhelp reduce or prevent the second and third cannulas 46, 48 from bendingcaused by repeated insertion into septums 16 a (FIG. 22) of the fillreservoirs 16. In one embodiment, the cannula guide 82 b includes atleast one non-pierceable tube 82 e such that the ends of the second andthird cannulas 46, 48 are not dulled by or pierce into the polymericmaterial of the cannula guide 82 b as the tray 82 is moved. In oneembodiment, the non-pierceable tubes 82 e are comprised of metal. In oneembodiment, the second and third cannulas 46, 48 remain at leastpartially within the cannula guide 82 b after assembly in all positionsof the tray 82. In one embodiment, a proximal end 82 d tapers toward theentrance of the tubes 82 e to help direct the second and third cannulas46, 48 into the tubes 82 e during assembly of the fluid transfer device10. A distal end 82 c of the cannula guide 82 b may extend into the tray82 for engagement with the fluid delivery device 24 (FIG. 12). In oneembodiment, the distal end 82 c of the cannula guide 82 b is tapered(e.g. frustoconcal shape) to help align the cannula guide 82 b with theseptum 16 a of the fill reservoir 16 as the distal end 82 c of thecannula guide 82 b engages with a larger frustoconical recess (notshown) in the fluid delivery device 24 proximate the septum 16 a of thefill reservoir 16. In one embodiment, the distal end 82 c of the cannulaguide 82 b includes a plurality of axially extending and radially spacedprojections.

With continued reference to FIGS. 12 and 13, in one embodiment, the tray82 includes a safety lock 94 configured to prevent the tray 82 frommoving relative to the tray support 80 when the tray 82 is empty. In analternative embodiment, the safety lock 94 is positioned on the traysupport 80. In one embodiment, the safety lock 94 prevents exposure ofthe first and third cannulas 46, 48 when the tray 82 is empty. In oneembodiment, inserting the fluid delivery device 24 containing the fillreservoir 16 within the tray 82 releases the safety lock 94 and allowsthe tray 80 to move toward the manifold 38. In one embodiment, thesafety lock 94 engages with a projection 96 within the tray support 80in the locked position and pivoting the safety lock 94, by inserting thefluid delivery device 24 containing the fill reservoir 16 in the tray82, pivots the safety lock 94 off of the projection 96 and unlocks thesafety lock 94. In one embodiment, removing the fluid delivery device 24containing the fill reservoir 16 from the tray 82 reengages the safetylock 94 with the projection 96. In one embodiment, the safety lock 94 isspring biased to the tray 82.

In one embodiment, the tray support 80 includes a ramp 98. In oneembodiment, the ramp 98 engages with a biasing member 100 attached tothe tray 82. In one embodiment, the biasing member 100 is a cantileverarm. In one embodiment, in the load/unload position (FIG. 19), thebiasing member 100 contacts the ramp 98 and is urged upwardly throughthe tray 82 to lift the fluid delivery device 24 containing the fillreservoir 16, at least partially, from the tray 82 such that a user cangrasp and remove the fluid delivery device 24 containing the fillreservoir 16 (not illustrated). In one embodiment, the biasing member100 may be bent downwardly toward the tray support 80 when inserting thefluid delivery device 24 containing the fill reservoir 16. In oneembodiment, the tray 82 is releasably engaged with the tray support 80in the load/unload, initial and fill positions such that a resistanceforce is required to move the tray 82 from the initial and fillpositions. In one embodiment, the tray 82 includes a release 102 that isreleasably engaged with the tray support 80 and extends into recesses104 in the tray support 80 in the load/unload, initial and fillpositions. In one embodiment, the tray support 80 is curved outwardlyproximate the viewing window 90 to accommodate the fluid delivery device24 containing the fill reservoir 16 when the biasing member 100 pushesthe fluid delivery device 24 containing the fill reservoir 16 from thetray 82 in the load/unload position.

Referring to FIGS. 15 and 19 the tray support 80 includes a first indent86 configured to accommodate a first finger 26 a of a user. In oneembodiment, the first indent 86 extends laterally across the traysupport 80. In an alternative embodiment, the first indent 86 isprovided at an angle (not shown). The tray support 80 includes a secondindent 88 configured to accommodate a second finger 26 b of the user. Inone embodiment, the first finger 26 a is a thumb and the second finger26 b is an index finger such that when the fluid transfer device 10 isgripped by the user as shown in FIG. 19, the fill reservoir 16 is atleast partially visible during filling of the fill reservoir 16. Theviewing window 90 may be positioned on each side of the fill reservoir20. In an alternative embodiment, a contrasting marking or background(not shown) may be provided on the interior of the tray support 80 suchthat the fluid 12 within the fill reservoir 16 is more easily seenthrough the viewing window 90.

Referring to FIG. 18, in one embodiment, a removable safety reservoir 92comprising a penetrable body is configured to block access to the secondand third cannulas 46, 48 and is provided in the tray 82 in the initialposition. In one embodiment, the safety reservoir 92 includes indicia 92a that provides instructions to the user such as “remove before use” and“replace after use”. In an alternative embodiment, the indicia 92 a mayinclude any information such as further instructions or productinformation (not shown).

Referring to FIGS. 19-21, in one exemplary use, the safety reservoir 92is removed from the tray 82 and the fluid delivery device 24 containingthe fill reservoir is inserted into the tray 82. In one embodiment, thetray 82 is closed to sealingly insert the second and third cannula 46,48 into the fill reservoir 16. In one embodiment, the supply reservoir14 is inserted over the distal end 44 a of the first cannula 44 suchthat the first cannula 44 and the third cannula 48 sealingly extend intothe supply reservoir 14 and at least one of the first and second catches66, 68 engages the supply reservoir 14. In one embodiment, the usergrasps the tray support 80 with first and second fingers 26 a, 26 b andgrasps the plunger tab 74 a with first and second fingers 26 c, 26 d(FIG. 19). In one embodiment, the user pulls the plunger 72 to expandthe metering reservoir 20 creating a negative pressure with respect tothe pressure in the supply reservoir 14 drawing fluid 12 from the supplyreservoir 14 through the first channel 40 and into the meteringreservoir 20 (FIG. 21). In one embodiment, the user depresses theplunger 72 or pulls the plunger 72 downwardly to contract the meteringreservoir 20 to expel liquid 12 through the second channel 42 and intothe fill reservoir 16 (FIG. 22).

In one embodiment, the air within the fill reservoir 16 is compressed bythe fluid 12 entering the fill reservoir 16 and travels through thethird channel 22 (FIG. 2) to equalize with the pressure within thesupply reservoir 14 (FIG. 2). In one embodiment, once the fill reservoir16 is filled or the fluid 12 in the fill reservoir 16 reaches the secondend 48 b of the third channel 22, any additional liquid 12 delivered tothe fill reservoir 16 is returned to the supply reservoir 14 via thethird channel 22. In one embodiment, if the supply reservoir 14 isemptied prior to filling the fill reservoir 16, the supply reservoir 14is exchanged with another supply reservoir 14 and is used to continuefilling the fill reservoir 16. In one embodiment, once the fillreservoir 16 is filled, the tray 82 is pulled away from the manifold 38to extract the second and third cannulas 46, 48 from the fill reservoir16 and the fluid delivery device 24 containing the fill reservoir 16 isremoved from the tray 82 and used in its intended application.

In one embodiment, the fluid transfer device 10 and the variouscomponents described above are comprised of materials that arecompatible with the fluid 12. In one embodiment, the fluid transferdevice 10 is comprised of medical-grade materials. In one embodiment,the manifold 38, the plunger tip 76 and the check valves 50, 52 arecomprised of one or more medical-grade polymers. In one embodiment, thefirst, second and third cannulas 44, 46, 48 are comprised of stainlesssteel.

Referring to FIGS. 23-24C, there is shown another exemplary embodimentof a fluid transfer device, generally designated 210. In one embodiment,the supply and fill reservoirs 214, 216 are moved relative to oneanother to create the pressure differential between the supply and fillreservoirs 214, 216. In one embodiment, the metering reservoir 220 ispositioned between the supply and fill reservoirs 214, 216. In oneembodiment, the fluid transfer device 210 includes an upper support 258coupled to the supply reservoir 214 and a lower support 259 coupled tothe fill reservoir 216. In one embodiment, the metering reservoir 220 iscomprised of a portion of the upper support 258 and a portion of thelower support 259. In one embodiment, the upper support 258 includes aplunger 272 and the lower support 259 includes a body of the meteringreservoir 220. In one embodiment, the first fluid flow path 218 extendsthrough the metering reservoir 220. In one embodiment the second fluidflow path 222 is flexible and/or extendable to accommodate the change indistance between the initial position (FIG. 24A) to the transferposition (FIG. 24B) and back to the transferred position (FIG. 24C). Inone embodiment, the upper support 258 partially overlaps the lowersupport 259 in the initial and transferred positions. In one embodiment,first and second valves 250, 252 are provided within the first fluidflow path 218 on opposite sides of the metering reservoir 220 such thatfluid only flow from the supply reservoir 214 to the fill reservoir 216.In an alternative embodiment, the first and second valves 250, 252 areprovided within the supply and fill reservoirs 214, 216 respectively(not illustrated).

In one embodiment, pulling the upper support 258 and the supplyreservoir 214 away from the lower support 259 and the fill reservoir 216expands the volume of the metering reservoir 220 and draws fluid 12 fromthe supply reservoir 214 into the metering reservoir 220. In oneembodiment, pushing the upper support 258 and the supply reservoir 214toward the lower support 259 and the fill reservoir 216 contracts thevolume of the metering reservoir 220 and forces the fluid 12 from themetering reservoir 220 into the fill reservoir 216. In such anembodiment, the first and second valves 250, 252 are configured topermit the one-way fluid flow through the first fluid flow path 218. Inone embodiment, the upper support 258 and the lower support 259 includea corresponding thread (not visible) positioned between the uppersupport 258 and the lower support 259 and are configured to twist theupper support 258 relative to the lower support 259 to move the uppersupport axially toward and away from the lower support 259. In oneembodiment, the thread or threads have a sufficient pitch and angle toallow the user to rotate upper support 258 relative to the lower support259 less than a full rotation, e.g. ¾ rotation, ½ rotation, ¼ rotation,and a sufficient vertical or axial separation. In one embodiment, alimit indicator 208 is provided between the upper and lower supports258, 259 and is configured to provide at least one of an audible andtactile feedback to the user to indicate when the metering reservoir 220is full and when the metering reservoir 220 has been emptied. In oneembodiment, first and second indicia 258 c are provided on the upper andlower supports 258, 259 to indicate which direction to twist the uppersupport 258. In one embodiment, at least part of the indicia 258 c isprovided between the upper and lower supports 258, 259 such that therequired motion is only visible when applicable.

In another embodiment, the upper and lower supports 258, 259 are movedrelative to one another with a push/pull motion, rather than a twistingmotion, to create the pressure differential between the supply and fillreservoirs 314, 316.

It will be appreciated by those skilled in the art that changes could bemade to the exemplary embodiment shown and described above withoutdeparting from the broad inventive concept thereof. It is understood,therefore, that this invention is not limited to the exemplaryembodiment shown and described, but it is intended to covermodifications within the spirit and scope of the present invention asdefined by the claims. Specific features of the exemplary embodimentsmay or may not be part of the claimed invention and combinations ofdisclosed embodiments may be combined. Unless specifically set forthherein, the terms “a”, “an” and “the” are not limited to one element butinstead should be read as meaning “at least one”.

Further, to the extent that the method does not rely on the particularorder of steps set forth herein, the particular order of the stepsshould not be construed as limitation on the claims. The claims directedto the method of the present invention should not be limited to theperformance of their steps in the order written, and one skilled in theart can readily appreciate that the steps may be varied and still remainwithin the spirit and scope of the present invention.

We claim:
 1. A fluid transfer device comprising: a metering reservoir; amanifold forming at least part of a first channel, the first channelfluidly connected with the metering reservoir, the first channelcomprising a first cannula extending from the manifold, the manifoldforming at least part of a second channel, the second channel fluidlyconnected with the metering reservoir, the second channel comprising asecond cannula extending from the manifold; a third channel extendingthrough the manifold and comprising a third cannula having a first endproximate a distal end of the first cannula and a second end proximate adistal end of the second cannula; a first check valve disposed withinthe first channel; and a second check valve disposed within the secondchannel, wherein the distal end of the first cannula and the first endof the third cannula are configured to fluidly couple to a supplyreservoir and the distal end of the second cannula and the second end ofthe third cannula are configured to fluidly couple to a fill reservoir,and wherein when the distal end of the first cannula and the first endof the third cannula are fluidly coupled to the supply reservoir, andthe distal end of the second cannula and the second end of the thirdcannula are fluidly coupled to the fill reservoir, expanding themetering reservoir draws fluid from the supply reservoir into themetering reservoir, compressing the metering reservoir expels the fluidfrom the metering reservoir into the fill reservoir and expelling thefluid into the fill reservoir displaces air in the fill reservoir intothe supply reservoir.
 2. The fluid transfer device of claim 1, whereinthe third cannula extends at least partially through the first cannula.3. The fluid transfer device of claim 1, wherein the first cannula has alarger cross sectional area than a cross sectional area of the secondcannula.
 4. The fluid transfer device of claim 1 further comprising: asupply support configured to couple the fill reservoir with the supplyreservoir.
 5. The fluid transfer device of claim 4, wherein the supplysupport includes at least one catch proximate the first cannula andconfigured to releasably retain the supply reservoir.
 6. The fluidtransfer device of claim 5, wherein the at least one catch includes atleast two catches spaced different distances from the first cannula. 7.The fluid transfer device of claim 4, wherein the supply supportincludes at least one catch proximate the first cannula and configuredto non-releasably retain the supply reservoir.
 8. The fluid transferdevice of claim 1 further comprising: a member supporting the secondcannula and the second end of the third cannula; and a tray supportconnected to the member and configured to align the fill reservoir withthe second cannula and the second end of the third cannula.
 9. The fluidtransfer device of claim 8 further comprising: a tray slideablyconnected to the tray support and configured to accommodate the fillreservoir.
 10. The fluid transfer device of claim 9, wherein at leastone of the tray support and the tray further comprises a safety lockconfigured to prevent the tray from moving relative to the tray supportwhen the tray is empty and exposing the second cannula.
 11. The fluidtransfer device of claim 9 further comprising: a safety reservoirconfigured to removeably couple with the tray and configured to blockaccess to the second cannula in an initial position.
 12. The fluidtransfer device of claim 1, wherein the first cannula extends from themanifold in a first direction and the second cannula extends in a seconddirection from the manifold, the first direction being generallyopposite the second direction.
 13. The fluid transfer device of claim12, wherein the metering reservoir extends from the manifold generallyin the first direction.
 14. The fluid transfer device of claim 1,wherein the metering reservoir includes a plunger.
 15. The fluidtransfer device of claim 14, wherein the plunger comprises a plunger rodand a plunger tip.
 16. The fluid transfer device of claim 1, wherein themetering reservoir has a metering stop.
 17. The fluid transfer device ofclaim 16, wherein the metering stop is adjustable.
 18. The fluidtransfer device of claim 1, wherein the first cannula is configured totransfer substantially all of the fluid from the supply reservoir. 19.The fluid transfer device of claim 1, wherein the first cannula includesa beveled tip.
 20. The fluid transfer device of claim 1, wherein thesecond cannula includes a beveled tip.
 21. The fluid transfer device ofclaim 1, wherein the second end of the third cannula comprises a beveledtip.
 22. The fluid transfer device of claim 1, wherein the third cannulais disposed within the first cannula and the first end of the thirdcannula is curved toward an inner side wall of the first cannulaproximate the distal end of the first cannula.
 23. The fluid transferdevice of claim 1, wherein the first end of the third cannula and thesecond end of the third cannula extend in opposite directions and thesecond cannula extends further from the metering reservoir than thesecond end of the third cannula.
 24. The fluid transfer device of claim1, wherein the volume of the metering reservoir is larger than thevolume of the fill reservoir.
 25. The fluid transfer device of claim 1,wherein the volume of the supply reservoir is larger than the volume ofthe metering reservoir.
 26. The fluid transfer device of claim 1,wherein the first and second channels each comprise less than 200 μl offluid transfer space.
 27. The fluid transfer device of claim 1, whereinthe fill reservoir comprises a fluid delivery device and the supplyreservoir comprises a vial.
 28. A fluid transfer device comprising: ametering reservoir; a manifold forming at least part of a first channel,the first channel fluidly connected with the metering reservoir, thefirst channel comprising a first cannula extending from the manifold,the manifold forming at least part of a second channel, the secondchannel fluidly connected with the metering reservoir, the secondchannel comprising a second cannula extending from the manifold; a thirdchannel extending through the manifold and comprising a third cannulahaving a first end proximate a distal end of the first cannula and asecond end proximate a distal end of the second cannula, the first endof the third cannula and the distal end of the first cannula extendingin a first direction and the second end of the third cannula and thedistal end of the second cannula extending in a second direction, thefirst direction being generally opposite the second direction; a firstcheck valve disposed within the first channel; and a second check valvedisposed within the second channel.